Pole-changer.



C. H. ROTH. POLE CHANGER.. APPLICATION FILED MAY s, 1911.

uhr -mm l SQL.

mmm.;

C. H. ROTH.

POLE CHANGER.

APPLICATION FILED MAY 5,1911.

1 .048,588. Patented pag.31, 1912.

2 SHEBTSSHEBT 24 lines 'o'f'an electric circuitwith the two sidesv vof the line through 'hich the current is sup- UNITEDSTATES PATENTA OFFICE.,

CHARLES n. ROTH, or CHICAGO, iLLmois, AssIGNOR 'ro THE ADAMS sa wEs'rLAKE COMPANY, A CORPORATION OE ILLINOIS.

POLE-CHANGER. Y

Specification of I.- :ters Patent. Patented Dec. 31, 191 2.

Applicatlouled May 5,1911. Serial No. 625,367.-

To all whom it may concern:

Be it known that I, CHARLES H. ROTH, a

` citizen of the United States, and resident. of

which the following is a specification, andV which are illustrated in the accompanyingv drawings, lforming a part thereof.

The invention relates to that class of elec-.

trical switches which are adapted to aut-oi matically transpose the connections of the plied. Such devicc` are used es )ecially in connection with circuits .supplie ,from d namos which may have the direction of rotation of their armatures lchanged, but in which circuits it is important to have theV current always flow in the same direction.

Such situations arise in connection with so-A called 'aXle-light systems for railway cars in which the dynamo is driven rom an ...axle of the car and consequently has its armature rotated in either direction accordingtqthe direction of travel of the car, and in which there is employed a storage battery.'

which is charged from the same dynamo.

The object of the invention is to generally vimprove upon devices of this character with view to securing reliability of action, sini Y plicity of construction and durability. One

form of the embodiment of the invention is hereinafter described and is illustrated in the accompanying drawings in 'which- Figure 1 is a rear elevation of the device with the back plate of its casing removed; Fig. 2 is a sectional View on the broken line 2 2 of Fig. 1, some of the parts beingY shown in elevation; Fig. 3 is a diagrammatic view of the circuit; Fig. 4 is a detail of the switch and some of its accessories and showing also the relation of the switch to the line terminals the view being on the line branch of the circuit which may be regarded as the negative` line is designated N. As

shown in the diagram the brush-11 isfconnccted with the negative' line through a .line the `terminal-111, the brush 15 associated with this terminal, the bus-bai'fl constituting a movable element of the switch, and the Y brush 17 associated with'the'terminal-1S If the line N. The positive line. is in 'connec- -tion with the brush` 12:--of-thegdynamo throughthe line. 19 leading. to the/terminal 20, the brush 21 associated withgt-his" ter .minah the b usrbar 22 forniing afinovable element ofthe vswitch 'andthey brush 23 as.-v I sociated with the terminal-1.24 V,of1tli'e'alinel?.'

Should the direction Vof rotation .ofthe arma- 11 would then becomefthe'v positive poleffaiid its brushY 12 thejl'negative p'olef' lhefpole changing switch is now shifted to-thr'ow-the bus-bars' 16 and 22 to the'riglit, tli'eformer connecting the terminal brush 171'wi'tli the terminal brush 25 associated with -theterminal' 26 of the line 27 leading `from the brush 12; and causing the bus-bar-22 vto con? ture of the `dynamo -be Vreversedfritsizbrush` f which the change of polarity is accomplishcd follows: A chamberccl casing 28 adapted to besecured to a suitable support, which in railway practice .nay be a part of the casing of the dynamo, contains the switch, the terminal brushes 15,' 17, 21, 23

and 25 and the mechanism for shifting the switch. The switch comprises 'a plate 29 pivotcd at 30 within the casing 28'nd carrying vthe bus-bars 1G and 22. A swinging arm 31 is pirated to the plate 29 adjacent the pivot. 30, its free end being connected with the 'outer end of the plate by means of a rctiact'ile helical spring 32, the attachment of the spring to thc plate being on its uiedian radius. An angle bar 33 -is pivotallv mounted upon the arm 31 near its outer end, one of its arms 34 normally extendingr parallcl with the bar and its other arm 35 projecrting laterally therefrom. Helical retractile springs 36, 37 connect the arm 34 of the p angle bar respectively with arms38, 39 projecting laterally fromv the pivoted end ofthe bar 31 and being of equal-tension hold the angle bar 33 in its normal position. A studY 40 projects outwardly, parallel with the pivot from the outer end vof the arm 35 of the angle bar and is preferably provided 'withV an antifriction sleeve or'roller 41. The

Y stud'40 engages a spiral cam 42 fixed upon the end of shaft 43, which may be, and usually is, the shaft of the dynamo armature. The cam 42 is carried by.a disk 44 having a hub 45 in the form of a '.'leeve which tits upon the end ofthe shaft 43 and is locked thereto by means.of a spline or key 46. As the cam 42 is rotated in one direction, referring to Fig. 5 in the direction of the movement of the hands of a clock, the stud 40 is carried to the center of the shaft 43. lVhen the cam is turned in" the opposite di rection the stud will be carriedto the outer.

end of the cam. The movement of the stud in either direction carries with it the arm 31 putting the spring 32 under tension and bringing lthe arminto Contact with one of A the lugs 51, 52 `which projectfrom 'thetace of the plate thereby causing the 'switch'plate 29to be thrown in the samel direction. Y f

vWhen the stud 40 isin either of its extreme positions .the spring 32tends to hold it in engagement with thecam 42, In order to avoid the clicking of the stud as the end of the cam leaves it vateach ofiits rotations, a magnet is pro-vided for holding the arm 31 against'the pull of the spring. l Ihis mag net may comprisel a..coil 4 7'carried by the switch plate 29 and .encirclingthe pivot 48 of the arm 3 1, this coil being connected with 'the bus-bars 16 and 22 by means of the wiresl 49, 50. The lugs 51, 52 inaddition to forming abutments for the arm 31 also constitute the polesv of thel magnet. The arm V31 is made of iron or steel and is consequently magnetically held against the pole piece 51, 52 toward which it is thrown by the action of the cam 42.v

' The casing 28 may be provided with a ball bearing for theshaft 43, as shown. To this end the casing isprovicled with an out standing hub portion 5.3 having at its end an instanding tiange 54. The inner ring 55 of the ball race is screwed upon the outer-end of the sleeve 45. The outer ring A56 of the ball' race is fitted Within the hub` 53, andeis held in placeby means of a lining 57 for the hub 53, having an outstanding flange 58,y bolted to-the inner wall of the casing 28. The balls of the bearing are shown at 5f). A tube C() provides means for lubricating the ball hearing.

` vAs the coil 4T is Supplied with current from the dynamo it follows that the magnetic attraction of the bar 31 ceases when the dynamo comes to rest, thereby permit' ting the spring 32 to draw the stud 40 into contact with the cam 42. When the dynamo i armature is again rotated, if its` direction of movement is reversed, the switch is thrown before sutiicient speed is attained to generate a current of. such strength as to magnetize the pole pieces 51, 52. It will lied on for throwing the switch as this. action will result from the positive engagement of the arm 31 with the elements l51 or 52.

`be seen that thespring 32 is not alone re- The brushes 21, 23, 15, 1,7v and 25 and the terminals with which they are associated are .fixed upon a bar 61 of insulating material which is secured to the wall of the 'casing 28.v The various wires leading from the dynamo and extending to the outer circuit enter the casing 28 through a suitable aperture as at 62. I

I claim as my inventionmounted in a plane parallelwith the plane of oscillation of the plate, and a stud carried by the plate 'and engageable with the cam.`

2. In a'pole changer, in combination, an oscillatable plate, a rotatable disk, a spiral rib carried by the face of the disk, anda stud carried by the plate and engageable `with the rib.

3. In a pole changer, in cbmbinatioman oscillatable plate, a swinging arm carried by the plate, lugs projecting from theplateY into Vthe path of the arm, a Stud carried by the arm, anda spiral cam engageable with the stud.

4. In a pole changer, in combination,` an oscillatable plate, a swinging arm carried by the plate, a helical spring connecting the free end of the arm with the plate, astud carried by the arm, and a spiral ca m engageable with the stud.

5. In a pole changer, in combination, an oscillatable plate, a swinging arm carried by the plate, a helical spring'connectingthe free end of the arm with the plate, a stud carried by the arm, a spiral cam engageable with the stud, and a pair of lugs projecting l 1 In a pole changer, in combination, anj oscillatable plate, a rotatable spiral camvfrom the face of the plate into the path ofY 8 In a pole changer, in combination, an the circuit for disengaging the switch from electric circuity having a plurality of termi the cam. nals, an oscillatuble switch plate coperating with the several terminals, a reversible 5 cam engageable with an appurtenance of the llvitnesses:

switch-plate for swinging the plate on its LOUIS K. GILLBON, pivot, and an electro-magnet in shunt from E. M. KLATCH/ER.

l CHARLES H. ROTH. 

